Per this comment you can go into the juce_gui_basics module in the Projucer and set JUCE_WIN_PER_MONITOR_DPI_AWARE to “Disabled”, and that will keep the plugin from trying to scale and cutting off the edges of the controls.
I’m just getting started with JUCE and just wanted to use the GenericAudioProcessorEditor class, so this works for me for now.
For what it’s worth, when I go to develop “real” plugins I’ll probably leave this disabled and implement a corner you can drag to make the GUI bigger, and try to save that scaling factor somewhere global. That’s what it seems other commercial plugins do at the moment.